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Forward osmosis

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https://www.readbyqxmd.com/read/28531853/methane-production-in-an-anaerobic-osmotic-membrane-bioreactor-using-forward-osmosis-effect-of-reverse-salt-flux
#1
Sheng Li, Youngjin Kim, Sherub Phuntsho, Laura Chekli, Ho Kyong Shon, TorOve Leiknes, Noreddine Ghaffour
This study investigated the impact of reverse salt flux (RSF) on microbe community and bio-methane production in a simulated fertilizer driven FO-AnMBR system using KCl, KNO3 and KH2PO4 as draw solutes. Results showed that KH2PO4 exhibited the lowest RSF in terms of molar concentration 19.1mM/(m(2).h), while for KCl and KNO3 it was 32.2 and 120.8mM/(m(2).h), respectively. Interestingly, bio-methane production displayed an opposite order with KH2PO4, followed by KCl and KNO3. Pyrosequencing results revealed the presence of different bacterial communities among the tested fertilizers...
May 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28528503/a-flux-enhancing-forward-osmosis-nanofiltration-integrated-treatment-system-for-the-tannery-wastewater-reclamation
#2
Parimal Pal, Sankha Chakrabortty, Jayato Nayak, Suman Senapati
Effective treatment of tannery wastewater prior to discharge to the environment as per environmental regulations remains a big challenge despite efforts to bring down the concentrations of the pollutants which are often quite high as measured in terms of chemical oxygen demand (7800 mg/L), total dissolved solids (5400 mg/L), chloride (4260 mg/L), sulphides (250 mg/L) and chromium. A pilot-scale forward osmosis and nanofiltration integrated closed loop system was developed for continuous reclamation of clean water from tannery wastewater at a rate of 52-55 L/m(2)/h at 1...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28527139/exploration-of-an-innovative-draw-solution-for-a-forward-osmosis-membrane-distillation-desalination-process
#3
Nguyen Cong Nguyen, Shiao-Shing Chen, Shubham Jain, Hau Thi Nguyen, Saikat Sinha Ray, Huu Hao Ngo, Wenshan Guo, Ngoc Tuan Lam, Hung Cong Duong
Forward osmosis (FO) has emerged as a viable technology to alleviate the global water crisis. The greatest challenge facing the application of FO technology is the lack of an ideal draw solution with high water flux and low reverse salt flux. Hence, the objective of this study was to enhance FO by lowering reverse salt flux and maintaining high water flux; the method involved adding small concentrations of Al2(SO4)3 to a MgCl2 draw solution. Results showed that 0.5 M MgCl2 mixed with 0.05 M of Al2(SO4)3 at pH 6...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28414439/mitigation-of-thin-film-composite-membrane-biofouling-via-immobilizing-nano-sized-biocidal-reservoirs-in-the-membrane-active-layer
#4
Alireza Zirehpour, Ahmad Rahimpour, Ahmad Arabi Shamsabadi, Mohammad Sharifian Gh, Masoud Soroush
This work investigates the use of a silver-based metal-organic framework (MOF) for mitigating biofouling in forward-osmosis thin-film composite (TFC) membranes. This is the first study of the use of MOFs for biofouling control in membranes. MOF nanocrystals were immobilized in the active layer of the membranes via dispersion in the organic solution used for interfacial polymerization. Field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) characterization results showed the presence of the MOF nanocrystals in the active layer of the membranes...
April 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28412549/enhancing-boron-rejection-in-fo-using-alkaline-draw-solutions
#5
Yi-Ning Wang, Weiyi Li, Rong Wang, Chuyang Y Tang
This study provides a novel method to enhance boron removal in a forward osmosis (FO) process. It utilizes the reverse solute diffusion (RSD) of ions from alkaline draw solutions (DSs) and the concentration polarization of the hydroxyl ions to create a highly alkaline environment near the membrane active surface. The results show that boron rejection can be significantly enhanced by increasing the pH of NaCl DS to 12.5 in the active-layer-facing-feed-solution (AL-FS) orientation. The effect of RSD enhanced boron rejection was further promoted in the presence of concentration polarization (e...
July 1, 2017: Water Research
https://www.readbyqxmd.com/read/28388525/development-of-combined-nanofiltration-and-forward-osmosis-process-for-production-of-ethanol-from-pretreated-rice-straw
#6
Masafumi Shibuya, Kengo Sasaki, Yasuhiro Tanaka, Masahiro Yasukawa, Tomoki Takahashi, Akihiko Kondo, Hideto Matsuyama
A membrane process combining nanofiltraion (NF) and forward osmosis (FO) was developed for the sugar concentration with the aim of high bio-ethanol production from the liquid fraction of rice straw. The commercial NF membrane, ESNA3, was more adequate for removal of fermentation inhibitors (such as acetic acid) than the FO membrane, whereas the commercial FO membrane, TFC-ES, was more adequate for concentration of the sugars than the NF membrane. The liquid fraction was subjected to the following process: NF concentration with water addition (NF(+H2O))→enzymatic hydrolysis→FO concentration...
March 28, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28380231/forward-osmosis-in-wastewater-treatment-processes
#7
Jasmina Korenak, Subhankar Basu, Malini Balakrishnan, Claus Hélix-Nielsen, Irena Petrinic
In recent years, membrane technology has been widely used in wastewater treatment and water purification. Membrane technology is simple to operate and produces very high quality water for human consumption and industrial purposes. One of the promising technologies for water and wastewater treatment is the application of forward osmosis. Essentially, forward osmosis is a process in which water is driven through a semipermeable membrane from a feed solution to a draw solution due to the osmotic pressure gradient across the membrane...
2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28342589/energy-consumption-by-forward-osmosis-treatment-of-landfill-leachate-for-water-recovery
#8
Syeed Md Iskander, Shiqiang Zou, Brian Brazil, John T Novak, Zhen He
Forward osmosis (FO) is an alternative approach for treating landfill leachate with potential advantages of reducing leachate volume and recovering high quality water for direct discharge or reuse. However, energy consumption by FO treatment of leachate has not been examined before. Herein, the operational factors such as recirculation rates and draw concentrations were studied for their effects on the quantified energy consumption by an FO system treating actual leachate collected from two different landfills...
May 2017: Waste Management
https://www.readbyqxmd.com/read/28342575/performance-of-a-novel-baffled-osmotic-membrane-bioreactor-microfiltration-hybrid-system-under-continuous-operation-for-simultaneous-nutrient-removal-and-mitigation-of-brine-discharge
#9
Nirenkumar Pathak, Laura Chekli, Jin Wang, Youngjin Kim, Sherub Phuntsho, Sheng Li, Noreddine Ghaffour, TorOve Leiknes, Hokyong Shon
The present study investigated the performance of an integrated osmotic and microfiltration membrane bioreactor system for wastewater treatment employing baffles in the reactor. Thus, this reactor design enables both aerobic and anoxic processes in an attempt to reduce the process footprint and energy costs associated with continuous aeration. The process performance was evaluated in terms of water flux, salinity build up in the bioreactor, organic and nutrient removal and microbial activity using synthetic reverse osmosis (RO) brine as draw solution (DS)...
March 14, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28332607/-breakthrough-osmosis-and-unusually-high-power-densities-in-pressure-retarded-osmosis-in-non-ideally-semi-permeable-supported-membranes
#10
Andriy Yaroshchuk
Osmosis is the movement of solvent across a membrane induced by a solute-concentration gradient. It is very important for cell biology. Recently, it has started finding technological applications in the emerging processes of Forward Osmosis and Pressure-Retarded Osmosis. They use ultrathin and dense membranes supported mechanically by much thicker porous layers. Until now, these processes have been modelled by assuming the membrane to be ideally-semipermeable. We show theoretically that allowing for even minor deviations from ideal semipermeability to solvent can give rise to a previously overlooked mode of "breakthrough" osmosis...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28318247/metalized-nanocellulose-composites-as-a-feasible-material-for-membrane-supports-design-and-applications-for-water-treatment
#11
Perla Cruz-Tato, Edwin O Ortiz-Quiles, Karlene Vega-Figueroa, Liz Santiago-Martoral, Michael Flynn, Liz M Díaz-Vázquez, Eduardo Nicolau
Herein, we study the feasibility of using nanocellulose (NC)-based composites with silver and platinum nanoparticles as additive materials to fabricate the support layer of thin film composite (TFC) membranes for water purification applications. In brief, the NC surface was chemically modified and then was decorated with silver and platinum nanoparticles, respectively, by chemical reduction. These metalized nanocellulose composites (MNC) were characterized by several techniques including: FTIR, XPS, TGA, XRD, and XANES to probe their integrity...
April 4, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28279608/influence-of-fertilizer-draw-solution-properties-on-the-process-performance-and-microbial-community-structure-in-a-side-stream-anaerobic-fertilizer-drawn-forward-osmosis-ultrafiltration-bioreactor
#12
Youngjin Kim, Sheng Li, Laura Chekli, Sherub Phuntsho, Noreddine Ghaffour, TorOve Leiknes, Ho Kyong Shon
In this study, a side-stream anaerobic fertilizer-drawn forward osmosis (FDFO) and ultrafiltration (UF) membrane bioreactor (MBR) hybrid system was proposed and operated for 55days. The FDFO performance was first investigated in terms of flux decline with various fertilizers draw solution. Flux decline was very severe with all fertilizers due to the absence of aeration and the sticky property of sludge. Flux recovery by physical cleaning varied significantly amongst tested fertilizers which seriously affected biofouling in FDFO via reverse salt flux (RSF)...
February 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28278103/evaluation-of-direct-membrane-filtration-and-direct-forward-osmosis-as-concepts-for-compact-and-energy-positive-municipal-wastewater-treatment
#13
Tobias Hey, Niada Bajraktari, Åsa Davidsson, Jörg Vogel, Henrik Tækker Madsen, Claus Hélix-Nielsen, Jes la Cour Jansen, Karin Jönsson
Municipal wastewater treatment commonly involves mechanical, biological and chemical treatment steps to protect humans and the environment from adverse effects. Membrane technology has gained increasing attention as an alternative to conventional wastewater treatment due to increased urbanization. Among the available membrane technologies, microfiltration and forward osmosis have been selected for this study due to their specific characteristics, such as compactness and efficient removal of particles. In this study, two treatment concepts were evaluated with regard to their specific electricity, energy and area demands...
February 22, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28259812/electrolysis-assisted-mitigation-of-reverse-solute-flux-in-a-three-chamber-forward-osmosis-system
#14
Shiqiang Zou, Zhen He
Forward osmosis (FO) has been widely studied for desalination or water recovery from wastewater, and one of its key challenges for practical applications is reverse solute flux (RSF). RSF can cause loss of draw solutes, salinity build-up and undesired contamination at the feed side. In this study, in-situ electrolysis was employed to mitigate RSF in a three-chamber FO system ("e-FO") with Na2SO4 as a draw solute and deionized (DI) water as a feed. Operation parameters including applied voltage, membrane orientation and initial draw concentrations were systematically investigated to optimize the e-FO performance and reduce RSF...
May 15, 2017: Water Research
https://www.readbyqxmd.com/read/28207245/regenerable-polyelectrolyte-membrane-for-ultimate-fouling-control-in-forward-osmosis
#15
Yan Kang, Sunxiang Zheng, Casey Finnerty, Michael J Lee, Baoxia Mi
This study demonstrated the feasibility of using regenerable polyelectrolyte membranes to ultimately control the irreversible membrane fouling in a forward osmosis (FO) process. The regenerable membrane was fabricated by assembling multiple polyethylenimine (PEI) and poly(acrylic acid) (PAA) bilayers on a polydopamine-functionalized polysulfone support. The resulting membrane exhibited higher water flux and lower solute flux in FO mode (with the active layer facing feed solution) than in PRO mode (with the active layer facing draw solution) using trisodium citrate as draw solute, most likely due to the unique swelling behavior of the polyelectrolyte membrane...
March 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28186405/thin-film-nanocomposite-tfn-membranes-incorporated-with-super-hydrophilic-metal-organic-framework-mof-uio-66-toward-enhancement-of-water-flux-and-salt-rejection
#16
Dangchen Ma, Shing Bo Peh, Gang Han, Shing Bor Chen
Zirconiumv (IV)-carboxylate metal-organic framework (MOF) UiO-66 nanoparticles were successfully synthesized and incorporated in the polyamide (PA) selective layer to fabricate novel thin-film nanocomposite (TFN) membranes. Compared to unmodified pure polyamide thin-film composite (TFC) membranes, the incorporation of UiO-66 nanoparticles significantly changes the membrane morphology and chemistry, leading to an improvement of intrinsic separation properties due to the molecular sieving and superhydrophilic nature of UiO-66 particles...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094920/antifouling-thin-film-composite-membranes-by-controlled-architecture-of-zwitterionic-polymer-brush-layer
#17
Caihong Liu, Jongho Lee, Jun Ma, Menachem Elimelech
In this study, we demonstrate a highly antifouling thin-film composite (TFC) membrane by grafting a zwitterionic polymer brush via atom-transfer radical-polymerization (ATRP), a controlled, environmentally benign chemical process. Initiator molecules for polymerization were immobilized on the membrane surface by bioinspired catechol chemistry, leading to the grafting of a dense zwitterionic polymer brush layer. Surface characterization revealed that the modified membrane exhibits reduced surface roughness, enhanced hydrophilicity, and lower surface charge...
February 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28067521/nanoscale-dynamics-versus-surface-interactions-what-dictates-osmotic-transport
#18
C Lee, C Cottin-Bizonne, R Fulcrand, L Joly, C Ybert
The classical paradigm for osmotic transport has long related the induced-flow direction to the solute membrane interactions, with the low-to-high concentration flow a direct consequence of the solute rejection from the semipermeable membrane. In principle, the same was thought to occur for the newly demonstrated membrane-free osmotic transport named diffusio-osmosis. Using a recently proposed nanofluidic setup, we revisit this cornerstone of osmotic transport by studying the diffusio-osmotic flows generated at silica surfaces by either poly(ethylene)glycol polymers or ethanol molecules in aqueous solutions...
January 19, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28033494/forward-osmosis-as-an-approach-to-manage-oil-sands-tailings-water-and-on-site-basal-depressurization-water
#19
Shu Zhu, Mingyu Li, Mohamed Gamal El-Din
As the volume of oil sands process-affected water (OSPW) stored in tailings ponds increases, it is urgent to seek for water management approaches to alleviate the environmental impact caused by large quantity of toxic water. Forward osmosis (FO) utilizes osmotic pressure difference between two solutions, thereby giving a potential to manage two wastewaters. In this study, FO was proposed to manage OSPW, using on-site waste basal depressurization water (BDW) as draw solution. To investigate its feasibility, both short and long-term OSPW desalination experiments were carried out...
December 21, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27998785/integrating-microbial-fuel-cells-with-anaerobic-acidification-and-forward-osmosis-membrane-for-enhancing-bio-electricity-and-water-recovery-from-low-strength-wastewater
#20
Jinmeng Liu, Xinhua Wang, Zhiwei Wang, Yuqin Lu, Xiufen Li, Yueping Ren
Microbial fuel cells (MFCs) and forward osmosis (FO) are two emerging technologies with great potential for energy-efficient wastewater treatment. In this study, anaerobic acidification and FO membrane were simultaneously integrated into an air-cathode MFC (AAFO-MFC) for enhancing bio-electricity and water recovery from low-strength wastewater. During a long-term operation of approximately 40 days, the AAFO-MFC system achieved a continuous and relatively stable power generation, and the maximum power density reached 4...
March 1, 2017: Water Research
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